Battery dying

I own a 1965 f-100 and I recently put power brakes on it and now something is draining on my battery, I can't figure out the source because all I did while changing my brakes was unhook the pressure switch for the brake lights, but they have been hooked back up and something is still drawing in on my battery, I checked the fuses and it'sNot running through there, and I'm not good with electrical, so I'm very confused at what could be drawing on my battery

Replaced dead battery in 1980 F-100 because no power. Still won't power up any lights, etc.. let alone turn motor over. Replaced starter - relay but still can't get power to elecrical system for som...

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